1.all, both同属前位限定词，但all可以与三类名词搭配，both只能与复数可数名词搭配，从意义上讲both指两者，all指三者或三者以上。如： How much time will you take for all this work? All children can be naughty sometimes. I got both these vases in Spain. Both cats are asleep. all和both用于否定时表示部分否定。例如： I cannot promote both of you. 我不能使你们两个都提升。 All flowers in his garden are not red. 他花园里的花并非都是红色的。 Both (of them) are not my brothers. 他们两个之中，只有一个是我的兄弟。 另外，表示部分否定的词还有every (everyone)。 例如： Every man can not be a poet. 并非人人都可以成为诗人。 要表达全部否定要用none / no (nobody) , neither, either等。例如： I cannot promote either of you. 你们两个我都不能提拔。 No flower in his garden is red. 他花园的花都不是红的。 2.all 和every从意义上十分相近，都用来泛指人或物，然而两者各自与名词搭配的类别不同，every只能与单数可数名词连用。如： All Mondays are horrible. (= Every Monday is horrible. ) all后可以跟the或this, my等限定词，而every却不行。例如： All the boys of this class are able to run faster than their teacher. 试比较： She was here all day.她在这里呆了一整天。She was here every day. 她天天都在这里。